Clarinets



Jan. 9, 1962 T. F. MCINTYRE ETAL 3,015,981

CLARINETS 6 Sheets-Sheet 1 Filed Sept. 9, 1958 7AM ATTORNEY?.

Jan. 9, 1.962 T. F. MclNTYRE ETAL 3,015,981

CLARINETS e sheets-sheet 2 Filed Sept. 9,- 1958 72% ATroRNsrs 5CLARINETS 6 Sheets-Sheet 3 Filed Sept. 9, 1958 ATTORNEYS Jan. 9, 1962 T.F. MCINTYRE ETAL 3,015,981

CLARINETS Filed Sept. 9, 1958 6 Sheets-Sheet 4 @502441 amlp m ATTORN YsJan. 9, 1962 T. F. MCINTRE ETAL 3,015,981

CLARINETS 6 Sheets-Sheet 5 Filed Sept. 9, 1958 Jan. 9, 1962 T. F.MCINTYRE ETAL @www ATTORNEYS Patented Jan. 9, 1962 3,015,981 CLARINETSThomas F. McIntyre and Robert J. McIntyre, both oi Elm St., Thomaston,Conn. Filed Sept. 9, 1958, Ser. No. 759,966 12 Claims. (Cl. 84-382) Thisinvention relates to a new and useful key mechanism for clarinets, thatsimplilies the playing of the instrument, by eliminating many of thedifficulties in lingering, which are inherent in the present system.

For example, our system hereinafter referred to as The McIntyre systemof keying eliminates the keys of the throat tones, Gli, A and B flat,found on all former clarinet systems. However, elimination of said keysdoes not eliminate the throat tones which have, in the standard system,been provided by placing the lingers on these y tone holes. The playingof these tones on clarinets constructed according to our invention willbe set forth in detail below.

The Git (2nd line of staff) on the McIntyre system is played with the4th finger, left hand, only, from the 3rd linger ring key around araised finger hole.

The A (2nd space of stati?) is played with either the 3rd (middlefinger) left hand, only, or the 3rd and 4th fingers left hand. With theGit and A lingers depressed the sound A is produced.

The Bb (3rd line of stal) is played With the A (middle linger left hand)and the 2nd or index linger left hand depressed together. The Bb mayalso be played by depressing the 2nd, 3rd, and 4th fingers together.

The F (thumb trill) lirst space of sta to G, second line of staff, isnow played by a new key located on the right hand side of theinstrument. This is normally played from the G# side key on the standardclarinet, which key, as noted above, has been removed in the McIntyresystem.

As a result of the simplified fingerings, through elimination of theusual Git-A-Bb keys, it is now possible for the beginner to learn morerapidly, and, it also allows the professional to play passages with easewhich heretofore required constant practice. Furthermore, the rapiditywith which the clarinet may be lingered, as a result of allowing thelingers to remain in a normal playing position at all times, will permitmore dilicult music to be written for the instrument. l

Because the B llat hole is large on the McIntyre system clarinet, the Bflat tone is always rich and powerful, as compared to a weak sound whenthe small speaker key is used on the standard clarinet. This B flat isused at all times on the McIntyre system.

The object of our invention is to provide a clarinet with a new keymechanism whereby the above and other innovations may effectively becarried out as will appear from the explanation of the mechanisms now tobe described generally with respect to the operation of same.

Action The complete invention of the McIntyre system is found on the topor upper section of the clarinet and the keys are normally either openor closed as follows:

Normally open or raised are Git ring key 1, the A ring key 11, Bb or Fitring key 20, Fit pad keyy 68, the D pad key 44. Normally closed are Gitpad key 51, A pad key S6, Bb pad key 61. With respect to the standardkeys on the left hand side the Bb side key and the speaker register keyare normally closed.

On the right hand side the Bb side key and the Fil side key are closed.The new F trill key which is unique in McIntyres structure is normallyclosed.

A raised tone hole 101, conventionally known as the D tone hole, hasbeen provided on the 3rd finger hole to accommodate the new Git lingerring 1 key assembly, thus allowing an air tight covering by the 4thlinger let't hand.

The spring action of the A pad key 56 on the Vclarinet has been reversedfrom that of the standard system by the addition of a needle spring 60,whereby the normal position of applicants A pad key 56 is closed. The Aring 11 key assembly, and a connection 46 from the D pad key 44, areheld in a normal raised position by means of a needle spring 150 actingon hook 26. The heavier spring action on the A ring key 11 holds the Apad key 56 in a closed normal position rthru rocker mechanism andextension 9. When the A ring key 11 is depressed, the A pad key 56opens, due to the reverse spring action of the lighter spring on the padA key 56 and a free action of the A rocker 75;

When it is necessary for the A pad key 56 to remain closed, even thoughthe A ring key 11 is depressed, a key operated from the thumb, or Fhole, provides a holding down action to the A rocker 75. A bar 8,extending from the holding bar 9 of the A ring key 11, to beneath theholding down bar 7 of the Git ring key 1, lifts the Git ring key 1,allowing the Gli pad key 51 to open with the A pad key 56, to producethe sound A.

rthe Gti key 1 assembly operates in the same manner as the A key 11assembly. The normal closed position of the Git ring key 1 has beenreversed to normal open by means of a needle spring 34 and hook 6. Thenew Gt uger ring key 1, from the 3rd finger hole, holds the Gti pad key51 in a closed position when not in use. When the 3rd finger ring keyGit 1 is depressed, an extending bar tLl., back to the Gli rocker 74allows the Gli pad key 51 to open, thus enabling the player to play Gilfrom the 3rd finger hole 101. When it is necessary for the Git pad key51 to remain closed, even though the 3rd linger ring key (Git 1) isdepressed, a key operated from the thumb, or F hole provides a holdingdown action to the rocker 74.

The D key pad 414 assembly only may be operated from the right hand,when it becomes necessary to play the fork Bb or Eb which is standard onall Boehm system clarinets. Without our split key action, the fork Bliat and E flat would not Ebe playable because it is a4 directconnection from' the new A ring key 11 from the 2nd linger hole 102rconventionally known as the E tone hole, and, the A pad key 56 wouldopen when it should remain closed for these 2 important notesfork B liatand E flat.

The B flat tone is played from the -Flt (1st hole 103, conventionallyknown as the F tone hole), with the A linger ring 11 (2nd hole)depressed. The action of the B ilat pad key 61 is also constructed on areverse spring arrangement (comparable to A ring key and Gli ring keyabove). In a normal open position of the 1F# ring key v20 the Bb rocker76 holds the Bb .pad key 61 in a closed position.` When the F# ring key2t! is depressed, with the A ring key 11, the B ilat pad key 61 opens,due to the free action of the B flat rocker 76, plus the heavy spring 78of the Fil ring key 20 working against the lighter spring 65 of the Bflat pad key 61. v

When it is necessary for the B liat pad key 61 to remain closed, eventhough the Ft ring key 20 is depressed, a holding down bar I57 from theA pad key 56, over the B liat pad key 61, provides a holding downaction.

The thumb holding down rocker key 81 is operated from the F thumb ringkey. When this F thumb ring key is depressed, it immediately lifts arocker key, and provides a holding down on the back of the Gli and A padkeys 51 and 56, thus allowing the said keys to remain closed when theiirst, second and third finger rings (Fit, A and Gil ring keys) aredepressed.

`Because of the delicate operation of this mechanism, and the'manynotesthat the 1st, 2nd, and 3rd ring keys (Fit, A and Git ring keys)will play la bounce or bubble i.e. an extra tone not desired issometimes produced ouvarious notes, due to the rapid iingering of theinstrumentfrom one note `to another. In `order toeliminate thissituation, the rocker mechanism has been designed to lallowaslightv pickup .e., lost'motion or play on the IB-flat rocker 76. For example, whenplaying Ifrom Fit (11st hole, the Aconventional F tone hole only) to A(2ndghole,'the conventional E tone hole only), the fingersmovesourapidlyas to cause the B` flat pad key 61 to move slightlyv whenthereverse spring `action of the B flat ring key 20 isreleased The delayor pickup movement on the'B'ilat rocker erases this situation.

Also,^the Fit ring key 20 hasbeen split and separated so that the F ypadkey may be independently operated with 'respect to the Ft ring key so asto operate independently with either the F thumb key, or with theFti padkey 68. This eliminates movement of the B at pad key61 when the notes Ato F (thumb key) are desired.

The 'F trill key, new with applicants (109, FIG. l), is constructed onthe right hand side of the clarinet. 4lit is the V'highest ofthe 3 sidekeys, and it is held down in a normal closed position `bymeans Aof aflat spring 110. It is `:depressed with the index ringer of the righthand when the F'to G trill isv required.

Fork means the right hand index ringer is down i.e. onthe lower sectionand the left hand index tinger is down ony the upper section.

'Apractical embodiment of our invention is` illustrated in the`accompanying drawings in which the parts are identified by the samenumerals in the several figures. It will be understood that the clarinetbody per se is` similar to that of the standard instrument and comprisesthe mouthpiece 118, upper section and lower section 119'.

Referring to the drawings:

'.FIG. lrepresents a layout of the upper section of the instrument withthe requisite number of holes arranged according to our invention.

FIG. 2 represents a'layout of the top key stack, as we refer to it,illustrating the keys arranged according tothe invention, .e., the topstack'assembly.

FIG. 3 represents a layout of the lower key section, or

. lower-stack as we term it, showing the lower stack 'fassemblyofkeya'also located on the uppersection.

iFIG. 4 represents, in detail, the Git ring key.

"FIG 5 represents, in-detail, the A ring key.

PIG. -6 represents in detail, the B ilat (or Ft) ring key.

FIGS. 7 and '8 represent elements for operatively holding these keys `ofthe top stack" in operative relationship.

FIG. 9 represents vthe 'Git rocker.

FIG. `1`0 represents the A rocker.

FIG. 1.1 represents the`B`at rocker. f1516.12 represents the rockerscrew.

1 FIG. 13 represents the B iiat rocker in side elevation. vFIG. 1'4represents the F thumb holding'key or rocker key.

FIG. represents the assembly of the F thumb holding key, and the `Gitrocker, A rocker-and B fiati-ecker.

FIG. 16 represents the screw for holding the assembly of FIG. 15 inoperativerelationship.

FIG. A17 represents the'D pad key.

FIG. 18 represents the G pad key.

f FIG. 19 represents the A pad key.

FIG. ,ZOMrepresents -the Bviiat pad key.

FIG. 21 represents .the E or Fi `pad key.

FIG. v2.2 represents the .longfscrewrfor holding the parts illustratedin FIGS. 17, 18, 19., 20, and 21 in operative relationship, and FIGS. 23and24 represent a spread view showing .the 'key relationship `of thelower stack and top stack with standard keys (dotted),

FIG. 25 is an enlarged sideview of a clarinet upper section constructedaccording to our invention showing the relationship of tone holes, ringsand pads plus the F trill key.

It should be borne in mind that we have not made changes in themouthpiece or on the lower body section ofthe standard instrument andthe following description will therefore be restricted to the Vsectionknown as the upper or top section of thestandard clarinet.

On .this upper section 30 we have arranged the appropriate holes; ourtop stack of keys; our .lower stack of'keys; our frocker mechanism; plusthe newlT Atrill key and the following standard keys, 4i.e.;speaker...key; Bv at (At) side pad key; B flat orAit, andD'i `or Eb thelatter being the sameV keys; alsorthe secondkey used .with the right4side key (which playsFti with thethumb `depressed); Cit (or Git) sidekey; and thumbkey.

The top Stack The McIntyre top stack .comprises the Git,.A, land B `flatring key 1, 1.1, 20 mechanisms, it being understood that 4these threering keys may Aalso .be used t0 produce other sounds. For example: TheBatring key 20 -is also Fit; B flat plus A, plus thumb Vgives low D` orhigh A, with the registe1""or speaker key; 1F# (B yat key) plus A, plusGit, plus thumb gives low C or high G with the register or speaker key.Register or .speaker key 'as used herein vdenote the usual keys .sodesignated by these terms-on. `thestandard instrument.

The Gi ring key (FIG. 4) consists ofthe-ring '1, arm 2i, longitudinal 3fixed at right angles to arm 2, and terminating in a cross arm orextension bar `4. Arm 4 carries at one end a short tube 5 provided. witha` spring hook 6l, and, adjacent the other end of arm` 4 isa short leg 7arranged to coact-with a-similarshort leg 8 on the A ring key extensionbar 9. `Fixed on the arm 2, between the ring 1 and the longitudinalZ isa short tube 10, the function `of which-will be stated below.

The A ring lfkey (FIG. '5L-consists of the ring Ai1 arm 12, tube 13 andthe longitudinal elements 14, 15, E16, and 17, `the latter carrying theextension bar 9 and yits leg 8.

It willbe noted -herefthat longitudinal elements111'3,*1"5 and 17 aretubular and element 13 carries: spring hook 26. Arm .12 carries a shortbar orieg v18, tappedadjacentiits outer end to receive .an adjustablemember 4such as 'a screw 19 `whiohis movable throughleg `13.

The B flat ring lkey (FIG. V6) ycomprisesflthe ring 20," its arm 211,longitudinal tube 22, and its'rightangled'extension bar 23. Arm 2d`carries a'shortright yangled leg Y24, tapped adjacent 'its outer lendkto receive fan adjustable member or Ascrew 25.

Theshort screw 25 isadjustable toward and awayftrom an extension 26 ofthe *Fil pad key 168'tocontactsame and -adjustthe relative-movementVofthe Ileg 2.4 and said extension 26.

The Git ring 1 Vkey is z*mounted inthel top sections l3ti`arxd 37 ofposts v112, 113, 114 based on the instrument-bodyr section 30 by meansof a long `screw 35 whichis-screwed into post section 36, the other-.endof said screw 35 being supported in said section 37. This screw passesthrough the tubular section 10to rockably support same thereon, theother Section5 of this key 1, being rockably supported on the longrod'27. The latte-ris pinned 'by a taperpinl to section 22,`andfsoldered at '32 (see FIG. 2).

The A ring key 11 isrockably mounted on screw `315 which passes throughsection 13 thereon and is also rockably supported on rod v'27 whichengages Isections "15 and 17 of this key. It will'be noted .the A `ringkey extension bar 9' is so located as to bring .ftheleg f8 under the leg7 of the `Gti ring key extension bar r4.

The B i'lat ringkey .Ztl is rockably mounted at .one `end on a pivotscrew 28 ina top-post section 29 which engages one end-of element 22,the `other'end of'this element being supported on the extreme threadedend of screw 35 passed through post section 36.

The mounting of these three ring keys Git, A and B at (1, v111 and 20)permits each to be operated independently of the others i.e., rocked onrod 27 and screw 35, by manipulating the rings 1, 11 or 20k as desired,and their assembly is illustrated in FIG. 2.

The lower stack The McIntyre lower stack, includes keys which areoperated with and partially controlled by the upper stack keys.

The lower stack is mounted beneath the upper stack and comprises thefollowing pad keys, to wit; D 44, E or Fit 618, G1151, A 56 and B dat61.

All of these keys are rockably mounted on the same long screw 38, shownin FiG. 22, which is supported in post sections 39, 40, 41 as shown inFIG. 3.

The D pad key 44 (FIG. 17) comprises a longitudinal 42, mounted on screw38, said longitudinal having an oiset section 43 at one end, and havingthe pad key 44 on arm 45 adjacent its other end. An adjusting bar 46extends at right angles to arm 45 for operative contact with screw 19 inarm 18 of the A ring key 11 and a spring hook 47 is carried by thelongitudinal 42 to operatively engage needle spring 48 in the usualmanner for returning the released key to its initial position.

The Gi? pad key (FIG. 18) comprises a longitudinai 49, and cross arm 58,the latter terminating in pad key 51. The usual spring hook 52 ismounted on longitudinal 49 for operative engagement with the usualneedle spring 53. Screw 38 passes through longitudinal 49 to rockablysupport same thereon.

The A pad key (FIG. 19) consists of the longitudinal 54 carryingadjacent one end the cross arm 55 which supports the pad key 56, and, atthe same end thereof, the adjusting or holding down bar 57. The latteris tapped to receive screw S8 which is adjustable toward and away fromthe B iiat pad key, denoted by 61. The longitudinal 54 also has a springhook 59 fixed thereon for coaction with needle spring 68 in the usualmanner. Screw 38 passes through the longitudinal 54 and rockablysupports same thereon.

The B flat pad key (FIG. 2G) includes the longitudinal 62 adapted toreceive screw 38 said element 62 carrying the cross arm 63 terminatingin the pad key 61. Also on longitudinal 62 is the spring hook 64 forcoaction with needle spring 65 in the customary manner.

The E or F# pad key (FIG. 21) comprises the longitudinal 66 and crossarm 67, the latter carrying the pad key 68 and adjusting bar 26. Also onlongitudinal 66 is the spring hook 69 adapted to operatively engage theneedle spring 48 to return the released key to its original position.Screw 38 passes through longitudinal 66 to rockably support samethereon.

It will be understood that when reference is made to the usual orcustomary action of the spring hooks and springs above referred to thatthis means they serve to hold down keys or return same to their originalpositions as is required to carry ont the objects of our invention. Itis also possible that the long screw 38 may be re placed by any suitableequivalent such as a rod or shaft upon which the several keys may berockably mounted.

The rocker mechanisms This mechanism forms an important segment of ourinvention and has been added, it being noted that there is no mechanismof this description on any standard clarinet.

Our rocker mechanism is illustrated in its assembled condition in FIG.15 and comprises the following: Gi? rocker including longitudinal 71, Aincluding longitudinal rocker 72 and B at rocker including longitudinal73. plus the F thumb holding key 81 or rocker key.

The rocker screw 70 (FIG. 16) passes through said key longitudinals 71,72, 73 and is itself mounted in post tops 174, 175 to serve as the pivotabout which the said Git, A and B flat rockers swing. At right angles tolongitudinals 71, 72, and 73 are the arms 74, 75, and 76, it ybeingnoted that on the B iiat rocker key longitudinal 73, there is provided aspring hook 77 for cooperation with needle spring 78. It will also beseen that on the latter key (B flat) there is a short arm 79 carrying ascrew 80 in one end thereof. This screw is for adjusting the degree ofmotion possible between the B flat ring key extension 23 and the B flatrocker extension thereunder. This screw provides the 10st motion betweenthese two parts which may be desirable to eliminate bubble or bounce ora third tone which is not necessary.

The needle spring 78 provides a holding down action for the B hat rockerkey.

The F thumb holding key (FIG. 14) comprises the longitudinal arm 81,right angled extension 82, and second longitudinal 83. On extension 82,between the longitudinals 81 and 83, is cross member or tube 84 adjacentpost top 74, said member 84 sometimes carrying a spring hook 85. In theend of longitudinal 81 is a screw 86 which is located to provide fineadjustment between the F thumb ring key 81, Git pad key 51 and A pad key56 in relation to their closing action which may be aiected by wear orswell of the cork or closing surface of said last two keys mentionedabove.

Standard keys on upper section In addition to the above keys and theiroperative construction herein ably set forth, the upper section of theinstrument carries the following standard keys i.e., standard speakerkey, B flat side pad key (may also be Di or E flat, B flat or At).

On the other side, right or left, are, as the case may he (two of each)B iiat or Ati, and Dit or E flat. Also there will be the second key usedwith the right side key which plays Fi with the thumb depressed, plusCit or Git side keys and the standard F thumbtrill key.

The standard keys shown in dotted outline in the layout constitutingFIG. 23 have nowbeen given numerals and are shown to emphasize thelocations of same with respect to the keys principally involved in ourinvention.

Referring to FIG. 1 it will -be noted that the upper section 38 isprovided with the required holes 101, 102 and 103 convention-ally knownas D, E and F tone holes, under ring keys 1, 11, and 2t) respectively;plus holes 184', 105, 196 under the pads of keys 44, Fit 68 and Gi 51respectively, plus holes 107 and 108 for pad key A 56 and B at 61. It isa feature of our invention that all the said holes are arrangedsubstantially lalong the same longitudinal axis in the body 30.

It will be noted further that the Git ringer hole 101 (conventionallyknown as the D tone hole) is now raised and provides a dat surface forthe fourth finger of the left hand.

The supporting posts 112, 113, 114 for the upper and lower stacks havenow been made so that each has three enlarged sections for carrying thepivots or securing means for the several keys and said posts may be axedto the body in any well known or approved manner.

With respect to the remaining parts of the instrument, they are as inthe standard clarinet with no changes having been made in either thelower section (bell end) or the mouth piece, our invention having beendirected to the upper section only.

Since it is evident that various changes may be made in the form,construction and arrangement of the several parts, we do not intend tobe limited to the particular embodiments herein shown and describedexcept as set forth in the appended claims.

What we claim is:

1. A clarinet including an upper section to be fingered principally bythe left hand, said section having the conventional D, E, and F toneholes, said section having 3,01 ses 1 '177 Gi?, A and Bb tone holes:insubstantial alignment with said iirstmentioned tone holes, ringsassociated with said D, E, and F ktone holes, pads associated with saidGli,.A

' n and Bb tone holes and yoperative connections -`between said D holering and said Gli hole pad, said E hole ring and saidA hole pad and saidF hole ring and said Bb hole pad, whereby Giimay be played by merelyplacing sa finger on and depressing the D hole ring; A may be played byadditionallyplacing a tingeron and depressing the E `hole ring and Bbmay beplayed by additionally placing 'a linger on and depressing the Fhole ring.

2. A structure according to claim l in which A may be played bydepressing the E hole ring only without the use of any other lingers.

3. A structure according to claim 1 in which Bb may be played bydepressing the E hole ring and the F hole ring.

' 4. A structure according to claim 1 in which the keys are arranged inupper and lower stacks, plus rocker mechanisms distinct from but adaptedto cooperate with said upper and lower stacks and means for supportingsaid stacks and rocker mechanisms in superposed relationship on saidupper section.

5. A clarinet including an upper section to be fingered by the lefthand,-said section having the conventional D, E, and F tone holes, saidsection having Gli, A and Bb tone holes in substantial alignment withsaid first mentioned tone holes, rings associated with said D, E, and Ftone holes, pads associated with said Gil, A and Bb tone holes andoperative connections `between said D hole ring and said lGit hole pad,said E hole ring and said A hole vring andsaid F hole ring and said Bbhole pad, said operative connection comprising rocker Vmechanismsdistinct from but adapted for cooperation with said keys, whereby Gi?may be played by merely placing a linger on Aand depressing the D holering; A may be `played by additionally placing a linger on anddepressingthe E hole ring and yBb may be played by additionally placinga finger on and depressing the F hole ring.

6. A structure `according to 'claim 5 'wherein the keys T58 are arrangedin superposed stacks, ,the .toprstack offkeys .comprising Git, A and Bb,ringkeymechanism 7. A structure according .to claim 5 "inwhichzsaidkeys are arranged in superposed stacks, the lowerstack of keys.comprising D. E or sEl, Gi?, lA `:and A*Bb pad they mechanisms. y

8. A combination according to cl-aim 5 in =which:the keys are arrangedin upper and lower stacks which are in superposed relationship togetherwith the rocker mechanisms comprising Gil, A, Bb 'and F .thumbholdingkey rockers.

9. A structure according to claim 5 having 4a Bb Arocker in `which theparts are so constructed and arranged-'that there is appreciable lostmotion in the Bb rocker tto .eliminate unintentional tonemovement .ofsaid rocker.

`10. A structure according to claim 1 including .an F thumb key and aFi? pad key wherein the Firing .is s plit horizontally whereby it may.be operated `independently with either the F thumb key or with the `Filpad key.

1l. A structure according to claim 1 in which .the vkeys are arranged ina top stack, a lower stack plus cooperating rocker mechanisms for saidStacks lwherein atleast one of the keys of the upper stack is providedwithimeans for limiting its motion with respect to at least one key ofthe lower'stac-k and at least one key of the lowerstack is provided withmeans for limiting `its movement with respect to atleast one other keyin the lower stack.

i2. A structure according to claim 1 including .an F trill key locatedon said upper sectionwhereby the F to G trill may be played bydepressing'said F trill -key normally with the index linger of the righthand;

'References Cited in the le of this patent UNITED STATES PATENTS 527,742Devault Oct. 16, 1894 1,235,394 Sternberg Jul-y v31, 19117 2,171,624 DeMarco Sept. 5, 1939 .2,183,423 Christensen Dec. 12, 1939 2,214,089Stover Sept. 10, 1940 Mazzeo Jan.A 6, 11959 UNITED STATES PATENT OFFICE.CERTIFICATE 0F CRRECTIN Patent No 30015981 January 9v, 1962 Thomas F.McIntyre et a1.

1t is hereby certified that error appears in the above numbered patentrequiring correction and that the said Letters Patent should read ascorrected below.

Column 'ZV line 32 for "rng, pad

Signed and sealed this` 8th day of May 1962.

irst occurrenceI read (SEAL) Attest:

DAVID L. LADD ERNEST W. SWTDEE i Attesting Officer Commissioner ofPatents UNITED STATES PATENT OFFICE v'CER'IIFICA'IE OF CORRECTION Patent*No 3-vOl5q98l January 9 1962 Thomas F. McIntyre et al.

It is hereby,T certified that error appears in the above numbered patentrequiring correction and that the said Letters Patent should read ascorrected below.

Column 7, line 32 for "rngf'v first occurrenceI read pad Signed andsealed this 8th day of May 1962.

(SEAL) Attest:

ERNEST w. SWTDER DAVID L. LADD Commissioner of Patents Attesting Officer

